Round Brilliant

The round brilliant cut is the most well-known diamond shape. It’s what most people think of when they think of diamonds. As the name suggests, it’s round and brilliant – and a feminine, elegant and timeless cut that will never date. Round brilliant diamonds remain by far the most popular choice for engagement rings. Their symmetrical shape and 58 facets offer a stunning sparkling display of light performance while hiding inclusions.


“The facet arrangement of a round brilliant does a great job at hiding inclusions. However, to reach maximum sparkle and get the full potential out of a round brilliant diamond, we recommend choosing an Excellent cut (EX) or Very Good (VG) cut grade”.

- Alison Cooper, Co-Founder of Alicia J


Round diamonds were first created in the 17th century, originally called European cut diamonds. Although circular, they were very different from today’s classic round brilliant diamonds. The first 58-facet cut was developed in 1919 by Marcel Tolkowsky, an engineer and diamond specialist known as the father of the round brilliant diamond. In his thesis, Diamond Design, he published a formula for cutting diamonds proportionally. According to this, the best-cut stones feature a 53% table, 59% total depth and a knife-edged girdle. Now, technology allows modifications to this formula to alter it to perfection, giving us the well-loved modern round brilliant shape.

Round Brilliant?
  • It is the only cut the GIA can issue a cut grade for, making them significantly higher in value and popularity.
  • Round brilliants are a timeless classic that will never date.
  • The light-reflecting qualities create a wonderful, bright diamond with superior sparkle.